Hoisting machinery



(No Model.)

R. SCHULZ.

HOISTVING MACHINERY. No. 380,637. Patented Apr. 3, 1888.

UNITED STATES PATENT rrrcn.

RICHARD SGHULZ, OF TEZEL, NEAR BERLIN, GERMANY.

HOlSTlNG MACHINERY.

SPECIFICATION forming part of Letters Patent No. 380,637, dated April 3, 1 888.

Application filed May 10, 1887. Serial No. 237,776. (No model.) Patented in Germany July 8, 1886, No. 39.139; in England Ant-1118, 1887, No. 5,626; in Italy June 30, 1887, XLII, 417, XXI, 21,565. and in AustriaHungary October 26, 1887, No. 16,990

and No. 46,837.

.To all whom, it may concern.-

Be it known that I, Brennan SoHuLz, a subject of the Emperor of Germany, residing at Tezel, near Berlin, Prussia, Germany, have invented certain new and useful Improvementsin Hoisting Machinery, (forwhich I have obtained Letters Patent in Germany, dated July 8, 1886, No. 39,139; in Great Britain, dated April 18, 1887, No. 5,626; in Italy, dated June 30, 1887, XLILNO. 417,XXI,N0. 21,565,21nd in Austria- Hungary, dated October 26, 1887, No. 16,990 and No. 46,837,) and I do hereby declare the following to be a full, clear, and exact descrip tion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Referring to the drawings, Figures 1 and 2 are side elevations of differently-constructed hoisting engines embodying my improvements. Fig. 3 is a central transverse section of Fig. 1. Fig. 4 is an end elevation of Fig. 3, and Fig. 5 is a detached detail view of the reversing-sector.

The invention relates to hoisting-engines, and more especially to such engines by which a load is to be lifted to different heights.

In engines of this class as heretofore constructed the cut-off or stop mechanism, such as the reversing-lever, has been operated by hand or automatically through the medium of a stop or lug secured to the hoisting-rope. When the reversing and stop lever is operated by hand] the engineer is obliged to watch the load and the return of the tackle from which the load is suspended to stop the engine at the proper time and then reverse the motion of the drivingshaft. If, on the other hand, the stop and reversing lever is operated automatically by a lug or other device on the hoisting-rope, intermediate mechanisms are necessary, which are in many instances impracticable, as on board of a ship, while the extent of the lift becomes a variable one owing to the stretching of the hoisting-rope.

The object of this invention is to provide means whereby the steam is automatically cut on, and whereby the extent of the lift may be adjusted, so that a load may be lifted to different heights, irrespective of any stretching in the hoisting-rope, and irrespective of any attention of the engineer in charge, and the steamcut off at the proper time to stop the operation of the engine.

To these ends the invention consists in an automatic cut-off mechanism, substantially as hereinafter described, and as set forth in the claims.

In the drawings, a indicates the driving shaft of the engine, and c the shaft that carries the hoistingdrum b, driven from shaft a by means of suitable gearing, a and c, which may be a pinion and gear wheel,or, as shown in Fig. 3, a worm and worm-wheel mounted respect ively on said shafts a and a.

On the end of the shaft 0, opposite to that on which is mounted the hoist-ingdrum b, is formed an endless screw-thread, d, that meshes with a corresponding thread formed in the periphery of a pinion, e, on a counter-shaft, e. The counter-shaft 6 also carries a sector, f, that has a segmental slot, f, in which slot are secured two lugs or arms, 9 and k, that project into the path of the reversing-lever t,

when mounted on said shaft e, as in Figs. 2 and 4, or into the path of an arm or arms, 71, when said lever is not carried by the shaft, as shown in Figs. 1 and 3. The lugs or stops 9 and h are adjustable in the slotf of the sector f, so that the lift or the number of revolutions of shaft 0 and drum 2) can be adjusted. If the reversing-lever i is brought into the position x, for instance, the shafts a 06' will be rotated until the lug It moves the lever 73 into the position .r to close the valve. If said lever is now moved to the position m the rotation of the shafts will be reversed until the lug or stop g moves the lever iback into position a".

If the lugs 0r stops 9 h are adjusted closer together or farther apart in the slot f" of the sector f, the number of revolutions made by shafts a c e is increased or decreased respectively, thereby increasing or decreasing the distance traveled by the load, irrespective of any stretch in the hoisting-rope, nor is it necessary to shorten or lengthen the rope when it is desired to increase or decrease the distance to which the load is to be hoisted.

The automatic out-off, through the medium of the reversing mechanism, renders all intermediate manipulations in reversing-gear of special construction unnecessary, while it renders the operation almost absolutely certain, which is not the case in hoisting-engines as now constructed, or in engines in which a reversing gear of special construction is employed.

The mechanism described cannot only be applied to the Stephenson reversing-gear, but to any other slidevalve gear, such as the Goooh, Allen, Hackworth reversing-gear, or to any construction of hoisting-engine.

The described automatic cut-oft mechanism will be found of especial advantage when applied to donkey engines of steamships for hoisting up ashes and merchandise, when the distance to which the ashes or merchandise to be hoisted or to which the latter may be lowered varies in vessels which have several decks. The principal advantage, however, lies in the fact that the steamdistributing-organ of the machine itself is directly operated to stop the operation of the engine, which has heretofore been effected by special valves which render the operation liable to uncertainty and to danger of breakage in the reversing-gear.

The engine may be a single or twin cylinder engine and provided with any known construction of reversing-gear.

Having now described my invention, what I claim is- 1. The combination, with the valve-lever i and shaft 0, of the shaft 0, geared to and driven by shaft 0, and a sector or segment provided with two tappets arranged to operate the lever 11 to out ofi the steam, substantially as and for the purpose specified.

2. The combination, with the valvelever i and shaft 0, of the shaft e, geared to and driven by shaft 0, and a sector or segment, f, provided with two tappets, g h, adjustable in a slot, f, in said segment, arranged to operate the lever 'i to cut off the steam, substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

RICHARD SOHULZ.

Witnesses:

G. LOUBIER, A. DEMELIUS. 

